Download Lesson 16-1

POINTS, LINES, AND PLANES
Lesson 16-1
CCSS 4.G.1
How can lines, angles,
and shapes be described,
analyzed, and classified?
How are angles
measured, added, and
subtracted?
WARM UP
Jenny pours 3 glasses of water. The
first glass is 3/8 full. The second is 3/4
full. The third is 3/6 full. Which glass
has the most water? Explain.

THINK AND WRITE
 Travel around the room with a partner. Use a
white board and list some things that are made
up of lines. Remember, lines are straight and
never curve.
What did you find?
TODAY’S LESSON
In this lesson, you will identify, name, and
draw points, lines, and planes.
Let’s look at the Envision Video for this
lesson and take the quiz.
POINTS - VOCABULARY
A point is an exact location in space. A point is
usually named with one capital letter, for example
Point A. There are many points along a line.
B
C
LINES
A line goes on forever and ever in both directions.
There is an arrow on either end of the line. Lines
are always straight.
 Classify these figures as either lines or not lines.
PARALLEL LINES
 Parallel lines are lines that will never meet or
cross one another.
Look around you! Where do you see examples of
parallel lines?
INTERSECTING LINES
 Intersecting lines cross one another at some
point.
Perpendicular lines are a type of intersecting lines.
When they meet, their corners form perfect right
angles, or square corners. Which of the examples
above are perpendicular lines?
PRACTICE!
Look at the map. Name streets
that form parallel lines and
intersecting lines.
MORE PRACTICE!
Look at the pictures. Identify the lines in the
picture as parallel or intersecting.
PLANE
A plane is an endless flat surface.
CHECK OUT THESE VIDEOS
Points Planes Lines -
PARTNER ACTIVITY
LESSON WRAP UP
 In this lesson, you learned how to name and describe points,
lines, and planes.
 Reflection: Explain what you did in math class today.
 Homework (16-1 Practice) for one “Paw Signature” and (16-1
Reteaching & Practice) if you want two “Paw Signatures.”
Website for Practice:
https://www.ixl.com/math/geometry/identify-parallelperpendicular-and-skew-lines-and-planes